EP 0667451 A1 19950816 - HYDRAULIC PUMP CONTROL DEVICE FOR CONSTRUCTION MACHINERY.
Title (en)
HYDRAULIC PUMP CONTROL DEVICE FOR CONSTRUCTION MACHINERY.
Title (de)
REGELUNGSANORDNUNG EINER HYDRAULISCHEN PUMPE FÜR BAUMASCHINEN.
Title (fr)
DISPOSITIF DE COMMANDE POUR POMPE HYDRAULIQUE UTILE POUR EQUIPEMENT DE CONSTRUCTION.
Publication
Application
Priority
- JP 9000964 W 19900727
- JP 19527689 A 19890727
Abstract (en)
A hydraulic pump control device to be used for construction machinery, which is provided with first and second hydraulic pumps driven by the engine, and hydraulic actuators connected to said first and second hydraulic pumps through first and second operation valves. The values of surplus horse power DELTA HP1 and DELTA HP2 are calculated on the basis of values of standard allowable suction horse power set for the first and second hydraulic pumps and the values of actual suction horse power (HP1), (HP2) of these pumps, and allowable discharge quantities (V1P), (VP) are calculated on the basis of the number (N) of revolutions of the engine, the values of discharge pressure (P1), (P2) of hydraulic pumps, the values of the surplus horse power, and the values of the standard allowable suction horse power. The smaller one out of the target discharge quantity and allowable discharge quantity is selected as minimum target discharge quantities (V1), (V2) and angles of swash plates of the hydraulic pumps are controlled so that these quantities are set at every hydraulic pump. Accordingly, the values of the suction horse power of the hydraulic pumps are properly controlled in a state wherein the sum of values of the standard allowable suction horse power is kept constant. <IMAGE>
IPC 1-7
IPC 8 full level
E02F 9/22 (2006.01); F04B 49/06 (2006.01)
CPC (source: EP KR US)
E02F 9/2235 (2013.01 - EP US); E02F 9/2292 (2013.01 - EP US); E02F 9/2296 (2013.01 - EP US); F04B 49/00 (2013.01 - KR); F04B 49/065 (2013.01 - EP US); F04B 2203/0209 (2013.01 - EP US); F04B 2205/05 (2013.01 - EP US); F04B 2207/041 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
WO 9102162 A1 19910221; DE 69031475 D1 19971023; DE 69031475 T2 19980423; EP 0667451 A1 19950816; EP 0667451 A4 19931214; EP 0667451 B1 19970917; JP H0359227 A 19910314; JP H0826552 B2 19960313; KR 0148560 B1 19990320; KR 920704014 A 19921219; US 5176504 A 19930105
DOCDB simple family (application)
JP 9000964 W 19900727; DE 69031475 T 19900727; EP 90910897 A 19900727; JP 19527689 A 19890727; KR 920700147 A 19920121; US 82086892 A 19920117